If you set UsePolicyBasedTrafficSelectors to $True on a connection, it will configure the Azure VPN gateway to connect to policy-based VPN firewall on premises. 'UsePolicyBasedTrafficSelectors' is an optional parameter on the connection. IKE Main Mode SA lifetime is fixed at 28,800 seconds on the Azure VPN gateways. PFS Group specified the Diffie-Hellmen Group used in Quick Mode or Phase 2.DH Group specifies the Diffie-Hellmen Group used in Main Mode or Phase 1.IPsec corresponds to Quick Mode or Phase 2.IKE corresponds to Main Mode or Phase 1.If GCMAES is used as for IPsec Encryption algorithm, you must select the same GCMAES algorithm and key length for IPsec Integrity for example, using GCMAES128 for both. The SA lifetimes are local specifications only, and don't need to match.Traffic Selector (if UsePolicyBasedTrafficSelectors is used).IPsec integrity algorithm (Quick Mode / Phase 2).IPsec encryption algorithm (Quick Mode / Phase 2).IKE integrity algorithm (Main Mode / Phase 1).IKE encryption algorithm (Main Mode / Phase 1).Your on-premises VPN device configuration must match or contain the following algorithms and parameters that you specify on the Azure IPsec/IKE policy: UsePolicyBasedTrafficSelectors** ($True/$False Optional, default $False if not specified) ( Optional: default values are used if not specified) The following table lists the supported configurable cryptographic algorithms and key strengths. S2S or VNet-to-VNet connections can't establish if the policies are incompatible. Consult with your VPN device vendor specifications to ensure the policy is supported on your on-premises VPN devices.Partial policy specification isn't allowed. You must specify all algorithms and parameters for both IKE (Main Mode) and IPsec (Quick Mode).You can only specify one policy combination for a given connection.IPsec/IKE policy only works on the following gateway SKUs:. Be aware of the following considerations: Refer to About cryptographic requirements and Azure VPN gateways to see how this can help ensure cross-premises and VNet-to-VNet connectivity to satisfy your compliance or security requirements. IPsec and IKE protocol standard supports a wide range of cryptographic algorithms in various combinations. Add/update/remove an IPsec/IKE policy for an existing connection.Create a connection (IPsec or VNet2VNet) with the IPsec/IKE policy.Create an IPsec/IKE policy with selected algorithms and parameters.Create a local network gateway for cross premises connection, or another virtual network and gateway for VNet-to-VNet connection.Create a virtual network and a VPN gateway.The instructions in this article help you set up and configure IPsec/IKE policies as shown in the following diagram. This article walks you through the steps to configure a custom IPsec/IKE policy for VPN Gateway Site-to-Site VPN or VNet-to-VNet connections using PowerShell.
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